Hi
Have just started putting up plasterboard, backed with foil and 1.25" expanded polystytrene. First board is up, but was bloody awkward compared with normal pb. Never used this newfangled stuff before...
Before I crack on tomorrow - any tips on How To Do it? It doesn't seem to want to 'score'n snap' like 'naked' pb, do you just have to saw it? Awkward pruning the stuff to size, being a composite material: anybody experienced with it care to share so I might save some time?
Cheers David
I had this stuff fitted to a loft bedroom when I bought my house in 1982. It provided insufficient vapour barrier and domestic water vapour condensed on the cold side and dripped back through and helped start roof joist rot. The whole lot had to come down and redone with a proper vapour barrier
Make absolutely sure that there is adequate vapour barrier other wise you might have similar problems. I'd say don't use it at all but you are possibly committed now and hopefully not too late to take precautions.
As for cutting the stuff, how about using a jack saw to cut from the polystyrene side until you just score the foil, then crack as usual finishing with a stanley knife from the 'good' side.
Bob
Oo-er. Did your plasterboard have foil backing? or inadequate? I have a sandwich of kingspan between the rafters - which I reckon fits pretty well - followed by an overlay of this insulation-backed board. Obviously the kingspan has foil both sides, and the pb is foil-backed; I originally thought I'd line the whole room with vapour barrier between the kingspan and polystyrene but decided that would have been overkill under the circumstances. Bad decision then?
David
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.